Re: [Qucs-help] WARNING: TR1: inserted virtual resistance at node

Am Di, 14.08.2007, 21:54, schrieb Karl Hiramoto:
Hi!
>>> Trying to do analyis of a simple inverter with a transformer and keep
>>> getting these warnings:
>>>
>>>
>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>> [R3,R2]
>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>> [R3,R2]
>>>
>>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>>
>>> I have QUCS 0.0.12 on gentoo linux
>>>
>>> Anyone help me figure out how to get around this?
>>>
>>
>> The warning tells that there is a floating node. The node is aobviously
>> the one between the two 1 Ohm resistors in the 3rd winding of the
>> transformer. The winding is completely floating... Change this and you
>> get rid of it.
>>
>> Hope this helps, Stefan.
>>
>>
> I tried grounding that point and got the same thing.
I did the same (see attachment) and the warning disappeared.
Stefan.

Thread view

Trying to do analyis of a simple inverter with a transformer and keep
getting these warnings:
WARNING: TR1: inserted virtual resistance at node `_net9' connected to
[R3,R2]
WARNING: TR1: inserted virtual resistance at node `_net9' connected to
[R3,R2]
Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
I have QUCS 0.0.12 on gentoo linux
Anyone help me figure out how to get around this?
Thanks
--
--
Karl Hiramoto http://karl.hiramoto.org/

Am Di, 14.08.2007, 16:12, schrieb Karl Hiramoto:
Hi Karl,
> Trying to do analyis of a simple inverter with a transformer and keep
> getting these warnings:
>
>
> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
> [R3,R2]
> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
> [R3,R2]
>
> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>
> I have QUCS 0.0.12 on gentoo linux
>
> Anyone help me figure out how to get around this?
The warning tells that there is a floating node. The node is aobviously
the one between the two 1 Ohm resistors in the 3rd winding of the
transformer. The winding is completely floating... Change this and you
get rid of it.
Hope this helps, Stefan.

Stefan Jahn wrote:
> Am Di, 14.08.2007, 16:12, schrieb Karl Hiramoto:
>
> Hi Karl,
>
>
>> Trying to do analyis of a simple inverter with a transformer and keep
>> getting these warnings:
>>
>>
>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>> [R3,R2]
>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>> [R3,R2]
>>
>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>
>> I have QUCS 0.0.12 on gentoo linux
>>
>> Anyone help me figure out how to get around this?
>>
>
> The warning tells that there is a floating node. The node is aobviously
> the one between the two 1 Ohm resistors in the 3rd winding of the
> transformer. The winding is completely floating... Change this and you
> get rid of it.
>
> Hope this helps, Stefan.
>
>
I tried grounding that point and got the same thing.
Thanks.
--
--
Karl Hiramoto http://karl.hiramoto.org/

Am Di, 14.08.2007, 21:54, schrieb Karl Hiramoto:
Hi!
>>> Trying to do analyis of a simple inverter with a transformer and keep
>>> getting these warnings:
>>>
>>>
>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>> [R3,R2]
>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>> [R3,R2]
>>>
>>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>>
>>> I have QUCS 0.0.12 on gentoo linux
>>>
>>> Anyone help me figure out how to get around this?
>>>
>>
>> The warning tells that there is a floating node. The node is aobviously
>> the one between the two 1 Ohm resistors in the 3rd winding of the
>> transformer. The winding is completely floating... Change this and you
>> get rid of it.
>>
>> Hope this helps, Stefan.
>>
>>
> I tried grounding that point and got the same thing.
I did the same (see attachment) and the warning disappeared.
Stefan.

Stefan Jahn wrote:
> Am Di, 14.08.2007, 21:54, schrieb Karl Hiramoto:
>
> Hi!
>
>
>>>> Trying to do analyis of a simple inverter with a transformer and keep
>>>> getting these warnings:
>>>>
>>>>
>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>>> [R3,R2]
>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected to
>>>> [R3,R2]
>>>>
>>>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>>>
>>>> I have QUCS 0.0.12 on gentoo linux
>>>>
>>>> Anyone help me figure out how to get around this?
>>>>
>>>>
>>> The warning tells that there is a floating node. The node is aobviously
>>> the one between the two 1 Ohm resistors in the 3rd winding of the
>>> transformer. The winding is completely floating... Change this and you
>>> get rid of it.
>>>
>>> Hope this helps, Stefan.
>>>
>>>
>>>
>> I tried grounding that point and got the same thing.
>>
>
> I did the same (see attachment) and the warning disappeared.
>
> Stefan.
I have QUCS 0.0.12 to open the file I opened it in an editor and
changed 0.0.13 to 0.0.12 . Hopefully that did not corrupt my file.
In this attachment, I changed the V2 pulsed from 1V to 5V (U=5V)
Starting the simulation, but it hangs. I see that there is a process on
my system "qucsator" using 100% of the CPU.
I tred the nightly snapshot from
http://qucs.sourceforge.net/download.html but running autogen.sh
qucs-core i get:
checking for gperf... /usr/bin/gperf
checking for admsXml... :
configure: error: The qucs-core package requires an installed adms.
Thanks.
--
--
Karl Hiramoto http://karl.hiramoto.org/
US VOIP: (1) 603.966.4448
Spain Casa (34) 951.273.347
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Yahoo_IM = karl_hiramoto GTalk= karl.hiramoto [at] gmail [d0t] com
--
Chess tonight.

Am Fr, 17.08.2007, 23:08, schrieb Karl Hiramoto:
Hi!
>>>>> Trying to do analyis of a simple inverter with a transformer and keep
>>>>> getting these warnings:
>>>>>
>>>>>
>>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected
>>>>> to
>>>>> [R3,R2]
>>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected
>>>>> to
>>>>> [R3,R2]
>>>>>
>>>>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>>>>
>>>>> I have QUCS 0.0.12 on gentoo linux
>>>>>
>>>>> Anyone help me figure out how to get around this?
>>>>>
>>>>>
>>>> The warning tells that there is a floating node. The node is
>>>> aobviously
>>>> the one between the two 1 Ohm resistors in the 3rd winding of the
>>>> transformer. The winding is completely floating... Change this and
>>>> you
>>>> get rid of it.
>>>>
>>>> Hope this helps, Stefan.
>>>>
>>>>
>>>>
>>> I tried grounding that point and got the same thing.
>>>
>>
>> I did the same (see attachment) and the warning disappeared.
>>
> I have QUCS 0.0.12 to open the file I opened it in an editor and
> changed 0.0.13 to 0.0.12 . Hopefully that did not corrupt my file.
No it does not.
> In this attachment, I changed the V2 pulsed from 1V to 5V (U=5V)
>
> Starting the simulation, but it hangs. I see that there is a process on
> my system "qucsator" using 100% of the CPU.
The qucsator process is the actual simulation engine.
You can set the rise/fall times (Tr/Tf) of the V2 source to 1u instead of
1ns... Then it should work.
> I tred the nightly snapshot from
> http://qucs.sourceforge.net/download.html but running autogen.sh
> qucs-core i get:
> checking for gperf... /usr/bin/gperf
> checking for admsXml... :
> configure: error: The qucs-core package requires an installed adms.
You can get adms from:
<http://sourceforge.net/projects/mot-adms&gt;
Hope this helps, Stefan.